﻿// Copyright © 2008, 2017, Oracle and/or its affiliates. All rights reserved.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most 
// MySQL Connectors. There are special exceptions to the terms and 
// conditions of the GPLv2 as it is applied to this software, see the 
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify 
// it under the terms of the GNU General Public License as published 
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but 
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
// for more details.
//
// You should have received a copy of the GNU General Public License along 
// with this program; if not, write to the Free Software Foundation, Inc., 
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA

using System;
using System.Data;
using System.Data.Entity.Core.Common.CommandTrees;
using System.Data.Entity.Core.Metadata.Edm;


namespace MySql.Data.Entity
{
  class FunctionGenerator : SqlGenerator
  {
    public CommandType CommandType { get; private set; }

    public override string GenerateSQL(DbCommandTree commandTree)
    {
      DbFunctionCommandTree tree = (commandTree as DbFunctionCommandTree);
      EdmFunction function = tree.EdmFunction;
      CommandType = CommandType.StoredProcedure;

      string cmdText = (string)function.MetadataProperties["CommandTextAttribute"].Value;
      if (String.IsNullOrEmpty(cmdText))
      {
        string schema = (string)function.MetadataProperties["Schema"].Value;
        if (String.IsNullOrEmpty(schema))
          schema = function.NamespaceName;

        string functionName = (string)function.MetadataProperties["StoreFunctionNameAttribute"].Value;
        if (String.IsNullOrEmpty(functionName))
          functionName = function.Name;

        return String.Format("`{0}`", functionName);
      }
      else
      {
        CommandType = CommandType.Text;
        return cmdText;
      }
    }
  }
}
